The Astrophysical Journal Letters最新文献

筛选
英文 中文
A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44 一颗休眠被捕获的奥尔特云彗星苏醒:(18916)2000 OG44
The Astrophysical Journal Letters Pub Date : 2025-06-05 DOI: 10.3847/2041-8213/add92b
Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, Dmitrii E. Vavilov and William A. Burris
{"title":"A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44","authors":"Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, Dmitrii E. Vavilov and William A. Burris","doi":"10.3847/2041-8213/add92b","DOIUrl":"https://doi.org/10.3847/2041-8213/add92b","url":null,"abstract":"We report the discovery of activity emanating from (18916) 2000 OG44 (alternately designated 1977 SD), a minor planet previously reported to be both an extinct comet and an asteroid on a cometary orbit. We observed 2000 OG44 with a thin tail oriented towards the coincident antisolar and antimotion vectors (as projected on the sky) in images we acquired on UT 2023 July 24 and 26 with the Apache Point Observatory 3.5 m Astrophysical Research Consortium telescope (New Mexico, USA). We also include observations made in Arizona with the Vatican Advanced Technology Telescope at the Mount Graham International Observatory and the Lowell Observatory Lowell Discovery Telescope near Happy Jack. We performed dynamical simulations that reveal 2000 OG44 most likely originated in the Oort cloud, arriving within the last 4 Myr. We find 2000 OG44, which crosses the orbits of both Jupiter and Mars, is at present on an orbit consistent with a Jupiter-family comet. We carried out thermodynamical modeling that informed our broader diagnosis that the observed activity is most likely due to volatile sublimation.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"192 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144236938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint 具有动态质量约束的第一褐矮星中盘子结构的提示
The Astrophysical Journal Letters Pub Date : 2025-06-04 DOI: 10.3847/2041-8213/add71f
Alejandro Santamaría-Miranda, Pietro Curone, Laura Pérez, Nicolas T. Kurtovic, Carolina Agurto-Gangas, Anibal Sierra, Itziar de Gregorio-Monsalvo, Nuria Huélamo, James M. Miley, Aina Palau, Paola Pinilla, Isabel Rebollido, Álvaro Ribas, Pablo Rivière-Marichalar, Matthias R. Schreiber, Jinshi Sai and Benjamín Carrera
{"title":"Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint","authors":"Alejandro Santamaría-Miranda, Pietro Curone, Laura Pérez, Nicolas T. Kurtovic, Carolina Agurto-Gangas, Anibal Sierra, Itziar de Gregorio-Monsalvo, Nuria Huélamo, James M. Miley, Aina Palau, Paola Pinilla, Isabel Rebollido, Álvaro Ribas, Pablo Rivière-Marichalar, Matthias R. Schreiber, Jinshi Sai and Benjamín Carrera","doi":"10.3847/2041-8213/add71f","DOIUrl":"https://doi.org/10.3847/2041-8213/add71f","url":null,"abstract":"We present high-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations at 0.89 mm of the Class II brown dwarf 2MASS J04442713+2512164 (2M0444), achieving a spatial resolution of 0 046 (∼6.4 au at the distance to the source). These observations targeted continuum emission together with 12CO (3–2) molecular line. The line emission traces a Keplerian disk, allowing us to derive a dynamical mass between 0.043 and 0.092 M⊙ for the central object. We constrain the gas-to-dust disk size ratio to be ∼7, consistent with efficient radial drift. However, the observed dust emission suggests that a dust trap is present, enough to retain some dust particles. We perform visibility fitting of the continuum emission, and under the assumption of annular substructure, our best fit shows a gap and a ring at 98.1 mas (∼14 au) and 116.0 mas (∼16 au), respectively, with a gap width of 20 mas (∼3 au). To ensure robustness, the data were analyzed through a variety of methods in both the image and uv planes, employing multiple codes and approaches. This tentative disk structure could be linked to a possible planetary companion in the process of formation. These results provide the first dynamical mass of the lowest mass object to date, together with the possible direct detection of a substructure, offering new insights into disk dynamics and planet formation in the very low-mass regime. Future higher spatial resolution ALMA observations will be essential to confirm these findings and further investigate the link between substructures and planet formation in brown dwarf disks.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ice Sublimation in the Dynamic HD 100453 Disk Reveals a Rich Reservoir of Inherited Complex Organics 动态HD 100453盘上的冰升华揭示了遗传复杂有机物的丰富储存库
The Astrophysical Journal Letters Pub Date : 2025-06-04 DOI: 10.3847/2041-8213/adc7b2
Alice S. Booth, Lisa Wölfer, Milou Temmink, Jenny Calahan, Lucy Evans, Charles J. Law, Margot Leemker, Shota Notsu, Karin Öberg and Catherine Walsh
{"title":"Ice Sublimation in the Dynamic HD 100453 Disk Reveals a Rich Reservoir of Inherited Complex Organics","authors":"Alice S. Booth, Lisa Wölfer, Milou Temmink, Jenny Calahan, Lucy Evans, Charles J. Law, Margot Leemker, Shota Notsu, Karin Öberg and Catherine Walsh","doi":"10.3847/2041-8213/adc7b2","DOIUrl":"https://doi.org/10.3847/2041-8213/adc7b2","url":null,"abstract":"Protoplanetary disks around luminous young A-type stars are prime observational laboratories to determine the abundances of complex organic molecules (COMs) present during planet formation. In contrast to their lower stellar mass counterparts, these warmer disks contain the sublimation fronts of complex molecules such as CH3OH on spatial scales accessible with the Atacama Large Millimeter/submillimeter Array (ALMA). We present ALMA observations of the Herbig Ae disk HD 100453 that uncover a rich reservoir of COMs sublimating from the dust cavity edge. In addition to CH3OH, we detect 13CH3OH for the first time in a Class II disk, revealing a factor of three enhancement of 13C in the disk large organics. A tentative detection of CH2DOH is also reported, resulting in a D/H of 1%–2%, which is consistent with the expected deuterium enhancement from the low-temperature CH3OH formation in molecular clouds and with the deuteration of CH3OH measured in comets. The detection of methyl-formate (CH3OCHO), at only a few percent level of CH3OH, is an order of magnitude lower compared to claims toward other organic-rich Herbig Ae disks but is more in line with organic abundance patterns toward the earlier stages of star formation. Together these data provide multiple lines of evidence that disks, and therefore the planet- and comet-forming materials, contain inherited interstellar ices and perhaps the strongest evidence to date that much of the interstellar organic ice composition survives the early stages of planet formation.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases 在Forbush期间宇宙射线光谱时间变化的地基观测减少
The Astrophysical Journal Letters Pub Date : 2025-06-04 DOI: 10.3847/2041-8213/add7d1
W. Mitthumsiri, D. Ruffolo, K. Munakata, M. Kozai, Y. Hayashi, C. Kato, P. Muangha, A. Sáiz, P. Evenson, P.-S. Mangeard, J. Clem, S. Seunarine, W. Nuntiyakul, N. Miyashita, R. Kataoka, A. Kadokura, S. Miyake, K. Iwai, H. Menjo, E. Echer, A. Dal Lago, M. Rockenbach, N. J. Schuch, J. V. Bageston, C. R. Braga, H. K. Al Jassar, M. M. Sharma, N. Burahmah, F. Zaman, M. L. Duldig, I. Sabbah and T. Kuwabara
{"title":"Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases","authors":"W. Mitthumsiri, D. Ruffolo, K. Munakata, M. Kozai, Y. Hayashi, C. Kato, P. Muangha, A. Sáiz, P. Evenson, P.-S. Mangeard, J. Clem, S. Seunarine, W. Nuntiyakul, N. Miyashita, R. Kataoka, A. Kadokura, S. Miyake, K. Iwai, H. Menjo, E. Echer, A. Dal Lago, M. Rockenbach, N. J. Schuch, J. V. Bageston, C. R. Braga, H. K. Al Jassar, M. M. Sharma, N. Burahmah, F. Zaman, M. L. Duldig, I. Sabbah and T. Kuwabara","doi":"10.3847/2041-8213/add7d1","DOIUrl":"https://doi.org/10.3847/2041-8213/add7d1","url":null,"abstract":"Observations of temporary Forbush decreases (FDs) in the Galactic cosmic-ray (GCR) flux due to the passage of solar storms are useful for space-weather studies and alerts. Here, we introduce techniques that use global networks of ground-based neutron monitors and muon detectors to measure variations of GCR rigidity spectra in space during FDs by (1) fitting count rate decreases for power-law rigidity spectra in space with anisotropy up to second order and (2) using the “leader fraction” derived from a single neutron monitor. We demonstrate that both provide consistent results for hourly spectral index variations for five major FDs, and they agree with daily space-based data when available from the Alpha Magnetic Spectrometer. We have also made the neutron monitor leader fraction publicly available in real time. This work verifies that ground-based observations can be used to precisely monitor GCR spectral variation over a wide range of rigidities during space-weather events, with results in real time or from short-term postanalysis.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Satellite Formation around the Largest Asteroids 最大小行星周围的卫星形成
The Astrophysical Journal Letters Pub Date : 2025-06-04 DOI: 10.3847/2041-8213/adc562
Kevin J. Walsh, Ronald-Louis Ballouz, Harrison F. Agrusa, Josef Hanus̆, Martin Jutzi and Patrick Michel
{"title":"Satellite Formation around the Largest Asteroids","authors":"Kevin J. Walsh, Ronald-Louis Ballouz, Harrison F. Agrusa, Josef Hanus̆, Martin Jutzi and Patrick Michel","doi":"10.3847/2041-8213/adc562","DOIUrl":"https://doi.org/10.3847/2041-8213/adc562","url":null,"abstract":"Satellites around large asteroids are preferentially found among those with the most rapid rotation and elongated shape. The taxonomic statistics are similarly skewed; in total, 13 asteroids larger than 100 km are known to have satellites, but none have been discovered among S-type asteroids. Previous modeling suggests that satellites could be generated by impacts, but spin and shape have never been tracked in models to relate collisional circumstances with those two observed properties concerning the primary. Here we show, by combining simulations of impacts into porous low-density asteroids, their subsequent disruption, reaccumulation, and long-term satellite stability, a direct pathway for the formation of satellites. The immediate distortion and elongation of a rotating target body provide a launching point for some debris distinct from simple ballistic ejecta trajectories. The debris that are found to originate from the distorted long axis is sourced primarily from 10 to 20 km below the surface and can be placed directly onto eccentric orbits with sufficiently large pericenter distances that avoid rapid reimpact. The specific energy and resultant total mass loss in satellite-forming collisions are not constraining, which explains the observed lack of correlation between asteroids with satellites and those that are part of large asteroid families.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ODIN: Star Formation Histories Reveal Formative Starbursts Experienced by Lyα-emitting Galaxies at Cosmic Noon ODIN:恒星形成历史揭示了宇宙正午时发射lyα的星系所经历的形成性恒星爆发
The Astrophysical Journal Letters Pub Date : 2025-06-03 DOI: 10.3847/2041-8213/adbf8c
Nicole M. Firestone, Eric Gawiser, Kartheik G. Iyer, Kyoung-Soo Lee, Vandana Ramakrishnan, Francisco Valdes, Changbom Park, Yujin Yang, Anahita Alavi, Robin Ciardullo, Norman Grogin, Caryl Gronwall, Lucia Guaita, Sungryong Hong, Ho Seong Hwang, Sang Hyeok Im, Woong-Seob Jeong, Seongjae Kim, Anton M. Koekemoer, Ankit Kumar, Jaehyun Lee, Vihang Mehta, Gautam Nagaraj, Julie Nantais, Laura Prichard, Marc Rafelski, Hyunmi Song, Ben Sunnquist, Harry I. Teplitz and Xin Wang
{"title":"ODIN: Star Formation Histories Reveal Formative Starbursts Experienced by Lyα-emitting Galaxies at Cosmic Noon","authors":"Nicole M. Firestone, Eric Gawiser, Kartheik G. Iyer, Kyoung-Soo Lee, Vandana Ramakrishnan, Francisco Valdes, Changbom Park, Yujin Yang, Anahita Alavi, Robin Ciardullo, Norman Grogin, Caryl Gronwall, Lucia Guaita, Sungryong Hong, Ho Seong Hwang, Sang Hyeok Im, Woong-Seob Jeong, Seongjae Kim, Anton M. Koekemoer, Ankit Kumar, Jaehyun Lee, Vihang Mehta, Gautam Nagaraj, Julie Nantais, Laura Prichard, Marc Rafelski, Hyunmi Song, Ben Sunnquist, Harry I. Teplitz and Xin Wang","doi":"10.3847/2041-8213/adbf8c","DOIUrl":"https://doi.org/10.3847/2041-8213/adbf8c","url":null,"abstract":"In this work, we test the frequent assumption that Lyα-emitting galaxies (LAEs) are experiencing their first major burst of star formation at the time of observation. To this end, we identify 74 LAEs from the ODIN Survey with rest-UV-through-NIR photometry from UVCANDELS. For each LAE, we perform nonparametric star formation history (SFH) reconstruction using the Dense Basis Gaussian-process-based method of spectral energy distribution fitting. We find that a strong majority (67%) of our LAE SFHs align with the frequently assumed archetype of a first major star formation burst, with at most modest star formation rates (SFRs) in the past. However, the rest of our LAE SFHs have significant amounts of star formation in the past, with 28% exhibiting earlier bursts of star formation, with the ongoing burst having the highest SFR (dominant bursts) and the final 5% having experienced their highest SFR in the past (nondominant bursts). Combining the SFHs indicating first and dominant bursts, ∼95% of LAEs are experiencing their largest burst yet: a formative burst. We also find that the fraction of total stellar mass created in the last 200 Myr is ∼1.3 times higher in LAEs than in mass-matched Lyman break galaxy (LBG) samples, and that a majority of LBGs are experiencing dominant bursts, reaffirming that LAEs differ from other star-forming galaxies. Overall, our results suggest that multiple evolutionary paths can produce galaxies with strong observed Lyα emission.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"25 1","pages":"L8"},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EP240414a: A Gamma-Ray Burst Jet Weakened by an Extended Circumstellar Material EP240414a:被扩展的星周物质削弱的伽马射线爆发射流
The Astrophysical Journal Letters Pub Date : 2025-06-03 DOI: 10.3847/2041-8213/add99d
Hamid Hamidani, Yuri Sato, Kazumi Kashiyama, Masaomi Tanaka, Kunihito Ioka and Shigeo S. Kimura
{"title":"EP240414a: A Gamma-Ray Burst Jet Weakened by an Extended Circumstellar Material","authors":"Hamid Hamidani, Yuri Sato, Kazumi Kashiyama, Masaomi Tanaka, Kunihito Ioka and Shigeo S. Kimura","doi":"10.3847/2041-8213/add99d","DOIUrl":"https://doi.org/10.3847/2041-8213/add99d","url":null,"abstract":"The recent Einstein Probe (EP) event EP240414a exhibits several unusual observational features. Its prompt and afterglow emissions place it between long gamma-ray bursts (LGRBs) and low-luminosity GRBs (LLGRBs). The event is followed by a fast optical transient (AT 2024gsa), initially exhibiting a thermal-like spectrum but later evolving into an unusually red peak at ∼3−5 days, which is difficult to explain with thermal emission. Using our generalized analytic framework for jet propagation in a circumstellar material (CSM), we explore a scenario in which a conventional LGRB jet is launched in a progenitor surrounded by a dense CSM. For a CSM of ∼0.03 M⊙ extending to ∼3 × 1013 cm, we find that the jet is significantly weakened before breaking out, becoming “barely failed,” an intermediate state between successful (LGRB) and completely failed (LLGRB) jets. This scenario naturally explains EP240414a’s multiwavelength observations, with the early thermal component produced by cocoon cooling emission and the red peak explained by nonthermal afterglow emission from the mildly relativistic barely failed jet (and its inner cocoon). Our work demonstrates the important role of extended CSM in shaping GRB jets and illustrates how early multiwavelength follow-up observations can reveal the physically diverse nature of jet-driven transients.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Receding Cosmic Shoreline of Mid-to-late M Dwarfs: Measurements of Active Lifetimes Worsen Challenges for Atmosphere Retention by Rocky Exoplanets 中晚期M矮星的后退的宇宙海岸线:活跃寿命的测量加剧了岩石系外行星对大气保留的挑战
The Astrophysical Journal Letters Pub Date : 2025-06-02 DOI: 10.3847/2041-8213/adda39
Emily K. Pass, David Charbonneau and Andrew Vanderburg
{"title":"The Receding Cosmic Shoreline of Mid-to-late M Dwarfs: Measurements of Active Lifetimes Worsen Challenges for Atmosphere Retention by Rocky Exoplanets","authors":"Emily K. Pass, David Charbonneau and Andrew Vanderburg","doi":"10.3847/2041-8213/adda39","DOIUrl":"https://doi.org/10.3847/2041-8213/adda39","url":null,"abstract":"Detecting and characterizing the atmospheres of terrestrial exoplanets is a key goal of exoplanetary astronomy, one that may now be within reach given the upcoming campaign to conduct a large-scale survey of rocky M-dwarf worlds with the James Webb Space Telescope. It is imperative that we understand where known planets sit relative to the cosmic shoreline—the boundary between planets that have retained atmospheres and those that have not. Previous works modeled the historic X-ray and ultraviolet (XUV) radiation received by mid-to-late M-dwarf planets using a scaling relation calibrated using more massive stars, but fully convective M dwarfs display unique rotation/activity histories that differ from Sun-like stars and early M dwarfs. We synthesize observations of the active lifetimes of mid-to-late M dwarfs to present an updated estimate of their historic XUV fluence. For known planets of inactive, mid-to-late M dwarfs, we calculate a historic XUV fluence that is 2.1–3.1 times the canonical XUV scaling relation on average, with the larger value including corrections for the pre-main-sequence phase and energetic flares. We find that only the largest terrestrial planets known to orbit mid-to-late M dwarfs are likely to have retained atmospheres within the cosmic shoreline paradigm. Our calculations may help to guide the selection of targets for JWST and may prove useful in interpreting the results; to this end, we define a novel atmosphere retention metric (ARM) that indicates the distance between a planet and the cosmic shoreline, and tabulate the ARM for known mid-to-late M-dwarf planets.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observations of a New Form of Partial Filament Eruption 一种新形式的部分细丝喷发的观测
The Astrophysical Journal Letters Pub Date : 2025-06-02 DOI: 10.3847/2041-8213/add939
Abril Sahade, Judith T. Karpen and Spiro K. Antiochos
{"title":"Observations of a New Form of Partial Filament Eruption","authors":"Abril Sahade, Judith T. Karpen and Spiro K. Antiochos","doi":"10.3847/2041-8213/add939","DOIUrl":"https://doi.org/10.3847/2041-8213/add939","url":null,"abstract":"Coronal mass ejections (CMEs) and coronal jets are two of the best-studied forms of solar eruptions, with the same underlying physics. Previous studies have presented partial eruptions producing coronal jets. We report, for the first time, a detailed analysis of three partial eruptions that segmented after the eruption began and produced CMEs. We use multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly, Solar TErrestrial RElations Observatory, and Solar Orbiter to reconstruct the three-dimensional evolution of the events. The magnetic field extrapolations indicated that the initial filaments were overlaid by pseudostreamer structures, and the splitting occurred after the interaction between the filament-supporting flux and external open field through their null points. The breakout mechanism seems to play a key role in both halting the system and splitting it. However, this initial evolution and the consequent splitting into an erupting flux rope above the prominence segment that failed to erupt pose severe challenges to theories of solar eruptions.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Origins of Coronal Alfvénic Waves 论日冕alfvsamic波的起源
The Astrophysical Journal Letters Pub Date : 2025-06-02 DOI: 10.3847/2041-8213/add7da
Richard J. Morton and Roberto Soler
{"title":"On the Origins of Coronal Alfvénic Waves","authors":"Richard J. Morton and Roberto Soler","doi":"10.3847/2041-8213/add7da","DOIUrl":"https://doi.org/10.3847/2041-8213/add7da","url":null,"abstract":"Alfvénic waves are considered a key contributor to the energy flux that powers the Sun’s corona, with theoretical models demonstrating their potential to explain coronal EUV and X-ray emission and the acceleration of the solar wind. However, confirming underlying assumptions of the models has proved challenging, especially obtaining evidence for the excitation and dissipation of Alfvénic waves in the lower solar atmosphere and tracing their propagation into the corona. We present an investigation of the Alfvénic wave power spectrum in the Sun’s corona, obtained from observations with DKIST Cryo-NIRSP. The data provide unprecedented temporal resolution and signal-to-noise ratio, revealing a detailed power spectrum out to frequencies exceeding 10 mHz. A broad enhancement in power dominates the spectrum, and we demonstrate that it is accurately reproduced using a physics-based model. The results corroborate the scenario where the corona is dominated by Alfvénic waves excited in the photosphere by horizontal convective motions, with low-frequency waves subject to reflection at the transition region and higher-frequency waves significantly dissipated by the partially ionized chromosphere. The coronal Alfvénic power spectrum also indicates that there are contributions from p-modes (via mode conversion) and a yet-unknown higher-frequency source. These results provide key insight into how the Sun’s convective motions imprint themselves on the corona and highlight the critical role of partial ionization, reflection, and damping in regulating upward-propagating Alfvénic waves. A further implication of this is that reconnection-driven Alfvénic waves likely play a smaller role in powering the corona and solar wind than has been suggested by recent studies.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信